They arise as axons of the cells in the lower1/3 of the motor area 4
in the medial 1/5 = medial corticobulbar + forntopontine fibresin the intermediate 3/5 = cortiocspinal fibresin the lateral 1/5 = temporo-pontine + lateral corticobulbar fibres
The medial corticobulbar fibers originate from the primary motor cortex (M1) in the precentral gyrus of the brain. These fibers are part of the corticobulbar tract, which is responsible for carrying motor signals from the cerebral cortex to the brainstem nuclei that control the muscles of the face, head, and neck.
It is a true statement that fibers of the optic nerve synapse at lateral genticulates of the thalamus.
These muscle fibers are said to be lateral.
On the lateral side of neck
origin of synthetic fibre
It is important to know how natural fibers are classified. Natural fibers are fibers from plant, animal and minerals. They are classified according to their origin.
The deltoid muscle fibers are separated into three distinct anatomical regions: the anterior (front), lateral (middle), and posterior (rear) fibers. Each region has different functions; the anterior fibers primarily assist in shoulder flexion and internal rotation, the lateral fibers are responsible for shoulder abduction, and the posterior fibers facilitate shoulder extension and external rotation. This organization allows for a wide range of shoulder movements.
motor nuclei of cranial nerves :)
Vestibulspinal tract (majority of its fibres are uncrossed)Olivospinal tractMedial Reticulospinal tract*mnemonic to memorize: V-O-MER
Natural fibers are classified into three categories based on their origin: plant fibers derived from plants (e.g. cotton, linen), animal fibers obtained from animals (e.g. wool, silk), and mineral fibers which come from mineral sources (e.g. asbestos). Each type of natural fiber has its unique properties and characteristics which make them suitable for different purposes.
The moderator band, also known as the septomarginal trabecula, sends fibers along the lateral walls of the ventricles towards the base and stimulates the papillary muscles. It helps coordinate the contractions of the ventricular walls and the papillary muscles to facilitate proper valve function.